9. Past emergency use vaccines have caused harm
The swine flu vaccine, Pandemrix, was rolled out in response to the 2010 pandemic. It was later withdrawn after causing over 1,000 cases of narcolepsy in children and teenagers. Public Health England undertook a major study of 4 to 18-year-olds and found that around one in every 55,000 jabs led to narcolepsy.  
Dengvaxia, a vaccine against Dengue, was withdrawn in 2017 after 19 children died of possible Antibody-Dependent Enhancement (ADE).  These vaccinated children became fatally ill after coming into contact with the real virus.
All previous attempts to develop coronavirus vaccines resulted in ADE in the test subjects, and so these vaccines were abandoned. ADE has not been ruled out in Covid-19 vaccines, as animal trials have been limited or skipped and there is not enough long-term data on the human participants. 
We must always be cautious when rolling out a new medical treatment, to avoid unintended harm. 
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It’s safer to wait